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On the Magma Chambers beneath Klyuchevskoi Volcano, Kamchatka

Khubunaya S.A., Gontovaya L.I., Sobolev A.V., Khubunaya V.S. (2018) On the Magma Chambers beneath Klyuchevskoi Volcano, Kamchatka // Journal of Volcanology and Seismology. Vol. 12, No. 2. pp. 14-30. doi: 10.1134/80742046318020045.

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Abstract

AAbstract—Numerous summit and parasitic eruptions of moderate potassium magnesian and high-alumina basalts and basaltic andesites, their mineralogic and geochemical features, and the composition of in situ chilled melt inclusions in the olivine of cinder lapilli discharged by Klyuchevskoi Volcano all provide evidence of the presence of magma chambers beneath the volcano. This is also supported by a dualism in the variation of CaO and A1203 concentrations in olivine and clinopyroxene during crystallization. The mineralogic features in the high-alumina basalts that were discharged by all parasitic eruptions of Klyuchevskoi provide evidence of magnesian magma being emplaced from a deeper chamber into a shallow high-alumina chamber. The distribution of incoherent elements in the volcano's magnesian and aluminiferous rocks shows that they came from a single mantle source. The geochemical and mineralogic data are in good agreement with the results of geophysical surveys that concern the structure and properties of the lithosphere beneath Klyuchevskoi.

Abstract (translation)

Многочисленные вершинные и побочные извержения умереннокалиевых магнезиальных и высокоглиноземистых базальтов и андезибазальтов, их минералогические и геохимические особенности, состав природнозакаленных расплавных включений в оливинах шлаковых лапилли вулкана Ключевской свидетельствуют о наличии магматических очагов под вулканом. На это же указывает, дуализм в изменении содержаний СаО и А1203 в оливинах и клинопироксенах во время кристаллизации. Минералогические особенности высокоглиноземистых андезибазальтов, всех побочных извержений вулкана Ключевской свидетельствуют о внедрении магнезиальной магмы из глубинного очага в малоглубинную высокоглиноземистую камеру. Распределение некогерентных элементов в магнезиальных и глиноземистых породах вулкана указывает на их генезис из одного мантийного источника. Геохимические и минералогические данные находятся в хорошем соответствии с результатами геофизических исследований структуры и свойств литосферы под вулканом Ключевской.
Item Type: Article
Title: On the Magma Chambers beneath Klyuchevskoi Volcano, Kamchatka
Title (translation): К вопросу о магматических очагах под вулканом Ключевской (Камчатка)
Language: English
Journal or Publication Title: Journal of Volcanology and Seismology
ISSN Print: 0742-0463
ISSN Online: 1819-7108
Subjects: State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.19 Геолого-геофизические исследования глубинного строения Земли > 38.19.19 Строение земной коры и верхней мантии по геофизическим данным
State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.33 Геохимия > 38.33.15 Геохимия отдельных элементов
State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.37 Петрография > 38.37.17 Породообразующие минералы
State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.37 Петрография > 38.37.19 Магматизм и магматические горные породы
State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.37 Петрография > 38.37.25 Вулканология
Volcanoes > 1 Volcanoes of the Kurile-Kamchatka Region > _ Volcanoes of Kurile-Kamchatka Region
Volcanoes > 1 Volcanoes of the Kurile-Kamchatka Region > 1.1 Kamchatka > Klyuchevskoy
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Depositing User: В.С. Хубуная
Date Deposited: 06 Sep 2018 03:25
Last Modified: 06 Sep 2018 03:25
URI: http://repo.kscnet.ru/id/eprint/3351

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